![]() Why does air in the cooling system cause overheating? This escaped air causes bubbling in the coolant/antifreeze reservoir, which can often be mistaken for boiling.Īside from a blown head gasket, there are several other causes for air inside in the cooling system, which we’ll come to later. One of the most common causes is a blown head gasket, in which the air pressure inside the cylinder heads is transferred to the cooling system. When air gets into this sealed system, air pockets can form and cause blockages, which can lead to bubbling and overheating.īubbling indicates rising air pressure in the cooling system, which is a sign that the flow of liquid is blocked by a pocket of air. ![]()
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